CMF / CRF Details

CMF ID: 2520

Replace TWLTL with raised median

Description:

Prior Condition:  Two way left turn lane (TWLTL)

Category: Access management

Study: Modeling and Evaluating the Safety Impacts of Access Management (AM) Features in the Las Vegas Valley, Mauga and Kaseko, 2010

 
Star Quality Rating:4 Stars  [View score details]
Rating Points Total:115
Crash Modification Factor (CMF)
Value:0.67
Adjusted Standard Error:
Unadjusted Standard Error:0.0692
Crash Reduction Factor (CRF)
Value:33  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:6.92
Applicability
Crash Type:Angle,Fixed object,Head on,Rear end,Run off road,Sideswipe,Single vehicle
Crash Severity:O (property damage only)
Roadway Types:All
Street Type:
Minimum Number of Lanes:
Maximum Number of Lanes:
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather:Not specified
Road Division Type:
Minimum Speed Limit:30
Maximum Speed Limit:45
Speed Unit:mph
Speed Limit Comment:
Area Type:Urban
Traffic Volume:Minimum of 4883 to Maximum of 96080 Annual Average Daily Traffic (AADT)
Average Traffic Volume:
Time of Day:Not specified
If countermeasure is intersection-based
Intersection Type:
Intersection Geometry:
Traffic Control:
Major Road Traffic Volume:
Minor Road Traffic Volume:
Average Major Road Volume :
Average Minor Road Volume :
Development Details
Date Range of Data Used:2002 to 2006
Municipality:
State:NV
Country:
Type of Methodology Used:Regression cross-section
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Aug 11, 2010
Comments: